Remove unneeded cpp_exception compile test.

It's 100% redundant with the test in the run directory, and fails on Windows.

tests/compile/cpp_exceptions.h

-extern int generic_error(void);
-extern int specified_error(void);
-extern int dynamic_error(void);

tests/compile/cpp_exceptions_T265.pyx

-cdef void raise_py_error():
-    pass
-
-cdef extern from "cpp_exceptions.h":
-    cdef int generic_error() except +
-    cdef int specified_error() except +MemoryError
-    cdef int dynamic_error() except +raise_py_error
-
-def test_it():
-    generic_error()
-    specified_error()
-    dynamic_error()